Why does it have to be from the female point of view? It's pretty ambiguous, which is one of the great things about this song. It could be about a man that was dumped by a woman, a woman dumped by a man, a man dumped by a man...well, you get the picture. It also goes further than just being dumped though: He gave up his whole life for her, she was everything to him, but now that he doesn't have her anymore, he doesn't really have a life anymore.
Why does it have to be from the female point of view? It's pretty ambiguous, which is one of the great things about this song. It could be about a man that was dumped by a woman, a woman dumped by a man, a man dumped by a man...well, you get the picture. It also goes further than just being dumped though: He gave up his whole life for her, she was everything to him, but now that he doesn't have her anymore, he doesn't really have a life anymore.